18547491457 has 16 divisors (see below), whose sum is σ = 20953391040. Its totient is φ = 16271985600.

The previous prime is 18547491451. The next prime is 18547491463. The reversal of 18547491457 is 75419474581.

It is an interprime number because it is at equal distance from previous prime (18547491451) and next prime (18547491463).

It is a cyclic number.

It is not a de Polignac number, because 18547491457 - 2³ = 18547491449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18547491398 and 18547491407.

It is not an unprimeable number, because it can be changed into a prime (18547491451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225207 + ... + 296332.

It is an arithmetic number, because the mean of its divisors is an integer number (1309586940).

Almost surely, 2^18547491457 is an apocalyptic number.

It is an amenable number.

18547491457 is a deficient number, since it is larger than the sum of its proper divisors (2405899583).

18547491457 is a wasteful number, since it uses less digits than its factorization.

18547491457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521664.

The product of its digits is 5644800, while the sum is 55.

The spelling of 18547491457 in words is "eighteen billion, five hundred forty-seven million, four hundred ninety-one thousand, four hundred fifty-seven".